You can run a properly tuned 10-1 motor on 94 octane from Sunoco. Their fuel has a actual rating of 95-96. The lead additive should be used for valve lube to prevent seat recession and as an added buffer to the Sunoco 94.
You do not need to mix if your timing and distributor are tuned and you are at an actual 10-1. Check cranking pressures as well.
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